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b in (-oo:+oo)
2*b+10 = 64-4*b // - 64-4*b
2*b-(-4*b)-64+10 = 0
2*b+4*b-64+10 = 0
6*b-54 = 0 // + 54
6*b = 54 // : 6
b = 54/6
b = 9
b = 9
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